LTE is the new standard of the 3GPP for the next generation of mobile telecommunications; It is the evolution of GSM/WCDMA. The key features of LTE are:
- OFDM in Download link, DFTS-OFDM (“Single-Carrier FDMA”) in Uplink.
- IP flat architecture with the SAE architecture.
- Low latency (10ms for User-plane, 100ms for Control-plane).
- MIMO antennas.
- Building on current investments in the GSM/UMTS.
- Flexible carrier bandwidths: 1.4MHz -20MHz. (1.4, 3, 5, 10, 15 and 20 MHz).
- FDD – TDD.
- LTE can do handover and roaming to existing networks.
- DL-peak: max 326,4 Mbit/s with 4×4 antennas, 172,8 Mbit/s with 2×2 antennas.
- UL-peak: Max 86,4 Mbit/s.
- Up to 200 users at the same time in a 5 MHz cell.
- Average optimum cell distance 5km. Cell of 30km still works good, with a little degradation. Cell of 100km is still acceptable.
- Increased spectrum flexibility, It supports spectrum slices of 1.5 MHz (up to 20 MHz).
WiMax is a broadband wireless technology. It was developed by the WiMax Forum in the last years and It is based on the 802.16 standard which has the objective of provide high speed data transfers over the air.
Some of the possible uses of WiMax are:
- As an alternative to DSL at the “last mile”.
- As an alternative to the backhaul and access of 2G, 3G, 3’9G infrastructure.
- As an alternative option to connect rural areas to Internet where there are not any telecom infrastructure or when It is not easy to deploy it (For example in rural or disaster areas).